Presentation at the 2012 FOSDEM MySQL devroom

6. Page compression

7. Less (smaller) data

11. Let’s say accesses to cached pages take no time at all

12. Let’s say all data is equally accessed

15. We want to cache the most-accessed places

22. space_id: tablespace (ibdata file or file number in file_per_table)

23. Page_no: page number (unique)

24. N_recs: number of records on the page

25. Data_size: size of data on the innodb page

26. Access_time: epoch timestamp of last access

27. Modified (1/0): something was modified in the page since load

34. Remove indexes if you can use others almost-as-efficiently

36. Buy more RAM ;)

39. Things get less efficient when you join to some other table, each record will generate a single page read for the linked record

47. Normally regarded as a bad idea

48. I don’t care.

53. Random inserts

54. Almost certain random lookups

55. Each lookup or write will cause a single page to be loaded into the buffer pool for the sole purpose of reading or writing a single record